Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Operating activities
Net income	$ 662,718	$ 25,940
Adjustments to reconcile net income to net cash provided by operating activities:
Interest sensitive and index product benefits	1,217,358	888,062
Amortization of deferred sales inducements	415,396	(2,675)
Annuity product charges	(185,264)	(177,313)
Change in fair value of embedded derivatives	(1,855,623)	1,306,163
Change in traditional life and accident and health insurance reserves	6,507	(5,113)
Policy acquisition costs deferred	(178,251)	(344,293)
Amortization of deferred policy acquisition costs	623,409	(45,856)
Provision for depreciation and other amortization	3,857	2,863
Amortization of discounts and premiums on investments	37,110	21,762
Realized gains/losses on investments	68,545	67
Realized gains/losses on investments		1,381
Distributions from equity method investments	190	1,160
Change in fair value of derivatives	409,201	(440,272)
Deferred income taxes	171,265	(14,676)
Loss on extinguishment of debt	2,024	0
Share-based compensation	7,515	9,402
Change in accrued investment income	20,179	(28,562)
Change in income taxes recoverable/payable	(35,202)	(3,740)
Change in other assets	2,307	(2,009)
Change in other policy funds and contract claims	(18,951)	(16,465)
Change in collateral held for derivatives	(506,735)	737,103
Change in collateral held for securities lending	(494,368)	365,592
Change in other liabilities	(22,281)	20,670
Other	4,325	(10,844)
Net cash provided by operating activities	355,231	2,288,280
Sales, maturities, or repayments of investments:
Fixed maturity securities, available for sale	3,344,860	2,184,662
Mortgage loans on real estate	230,042	207,054
Derivative instruments	633,948	352,634
Other investments	3,238	7,887
Acquisitions of investments:
Fixed maturity securities, available for sale	(2,279,427)	(4,214,476)
Mortgage loans on real estate	(723,154)	(474,734)
Derivative instruments	(557,709)	(620,638)
Other investments	(10,616)	(344,652)
Purchases of property, furniture and equipment	(12,440)	(3,148)
Net cash provided by (used in) investing activities	628,742	(2,905,411)
Financing activities
Receipts credited to annuity policyholder account balances	1,811,843	4,035,051
Coinsurance deposits	304,169	67,858
Return of annuity policyholder account balances	(2,922,187)	(2,626,214)
Repayment of subordinated debentures	(81,450)	0
Net proceeds from amounts due under repurchase agreements	0	(60,367)
Proceeds from issuance of preferred stock, net	290,260	0
Proceeds from issuance of common stock, net	1,738	412
Change in checks in excess of cash balance	(6,595)	(5,268)
Preferred stock dividends	(18,511)	0
Net cash provided by (used in) financing activities	(620,733)	1,411,472
Increase in cash and cash equivalents	363,240	794,341
Cash and cash equivalents at beginning of period	2,293,392	344,396
Cash and cash equivalents at end of period	2,656,632	1,138,737
Cash paid during period for interest:
Interest expense	17,677	26,490
Cash paid during period for income taxes:
Income taxes	4,810	28,193
Non-cash operating activity:
Deferral of sales inducements	$ 68,468	$ 140,960